Looked like landing lights on aircraft. Were brighter, iridescent, and twinkling.

Was looking towards Scottsdale airport, observing usual aircraft lights when I saw lights which didn't fit in. Aircraft lights were coming and going, but after five minutes or so these lights were unmoving. I went in to get a jacket, when I came back in about 20 sec. The lights were receding in the distance. they were gone in another few minutes. If I was looking at an aircraft, it was head on, and could not recede. I did not see an object, only two lights, which may or may not have been connected.